Tierney in Chill Factor

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While I was readin Chill Factor I kept saying there was no way that Tierney could be the killer because it would have been to easy. I am referring to the very beginning of the book, the first few pages. They set it up to make us think automatically that he did it. I mean he's at the grave sites, with a shovel and just guilt written across the page. But I was saying books don't do that because authors like to keep their audience guessing, so I never suspected Tierney as being the real killer. I actually thought it was going to turn out being Scott, i dont know why. Maybe because the way the story built around him and how his father always seemed to know something so terrible about his son. What do you think?